Combine or merge JSON on node js without jQuery

Question

I have multiple JSON like those  var object1    name   John    var object2    location   San Jose      They are not nesting or anything like that  Just basically different fields  I need to combine them into one single JSON in node js like this    name   John   location   San Jose     I can use jQuery just fine  Here is a working example in the browser   http   jsfiddle net qhoc agp54   But if I do this in node js  I don t want to load jQuery  which is a bit over use  plus node js  jQuery doesn t work on my Windows machine    So is there a simple way to do things similar to   extend   without jQuery

User · Answer

Lodash is a another powerful tool-belt option for these sorts of utilities   See    merge    which is recursive   var object        a       b   2       d   4       var other        a       c   3       e   5          merge object  other        gt     a       b   2   c   3       d   4   e   5

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You can use Lodash  const     require  lodash     let firstObject     email     email email com   let secondObject      name       first  message firstName        merge firstObject  secondObject

User · Answer

It can easy be done using Object assign   method -   var object1    name   John     var object2    location   San Jose     var object3   Object assign object1 object2    console log object3     now object3 is   name   John   location   San Jose

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A normal loop    function extend target        var sources      slice call arguments  1       sources forEach function  source            for  var prop in source                target prop    source prop                         return target     var object3   extend     object1  object2     That s a basic starting point  You may want to add things like a hasOwnProperty check  or add some logic to handle the case where multiple source objects have a property with the same identifier   Here s a working example   Side note  what you are referring to as  JSON  are actually normal JavaScript objects  JSON is simply a text format that shares some syntax with JavaScript

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If using Node version    4  use Object assign    see Ricardo Nolde s answer    If using Node 0 x  there is the built in util  extend   var extend   require  util    extend var o   extend      name   John     extend o    location   San Jose       It doesn t do a deep copy and only allows two arguments at a time  but is built in   I saw this mentioned on a question about cloning objects in node  https   stackoverflow com a 15040626   If you re concerned about using a  private  method  you could always proxy it      myutil js exports extend   require  util    extend    and replace it with your own implementation if it ever disappears   This is  approximately  their implementation   exports extend   function origin  add        if   add     typeof add      object   amp  amp  add     null            return origin             var keys   Object keys add       var i   keys length      while i--           origin keys i     add keys i              return origin

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A better approach from the correct solution here in order to not alter target   function extend      let sources      slice call arguments  0   result         sources forEach function  source        for  let prop in source          result prop    source prop                 return result

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Let object1 and object2 be two JSON object   var object1      name    John     var object2      location    San Jose      object1 push object2     This will simply append object2 in object1      name   John     location   San Jose

User · Answer

Here is simple solution  to merge JSON  I did the following    Convert each of the JSON to strings using JSON stringify object   Concatenate all the JSON strings using   operator  Replace the pattern     g with     Parse the result string back to JSON object  var object1    name   John    var object2    location   San Jose    var merged object   JSON parse  JSON stringify object1    JSON stringify object2   replace     g          The resulting merged JSON will be   name   John   location   San Jose

User · Answer

You can do it inline  without changing any variables like this   let obj1     name   John     let obj2     surname   Smith     let obj   Object assign     obj1  obj2        name   John   surname   Smith

User · Answer

Underscore s extend is the easiest and quickest way to achieve this  like James commented   Here s an example using underscore   var     require  underscore       npm install underscore to install   object1    name   John      object2    location   San Jose     var target     extend object1  object2     object 1 will get the properties of object2 and be returned and assigned to target  You could do it like this as well  depending on whether you mind object1 being modified   var target         extend target  object1  object2

User · Answer

You should use  Object assign     There s no need to reinvent the wheel for such a simple use case of shallow merging      The Object assign   method is used to copy the values of all enumerable own properties from one or more source objects to a target object  It will return the target object    var o1     a  1    var o2     b  2    var o3     c  3     var obj   Object assign o1  o2  o3   console log obj        a  1  b  2  c  3   console log o1         a  1  b  2  c  3    target object itself is changed   Even the folks from Node js say so       extend was never intended to be used outside of internal NodeJS modules  The community found and used it anyway    It is deprecated and should not be used in new code  JavaScript comes with very similar built-in functionality through Object assign      Update   You could use the spread operator  Since version 8 6  it s possible to natively use the spread operator in Node js  Example below   let o1     a  1    let o2     b  2    let obj        o1     o2         a  1  b  2     Object assign still works  though      PS1  If you are actually interested in deep merging  in which internal object data -- in any depth -- is recursively merged   you can use packages like deepmerge  assign-deep or lodash merge  which are pretty small and simple to use     PS2  Keep in mind that Object assign doesn t work with 0 X versions of Node js  If you are working with one of those versions  you really shouldn t by now   you could use require  util    extend as shown in the Node js link above -- for more details  check tobymackenzie s answer to this same question

User · Answer

You can also use this lightweight npm package called absorb  It is 27 lines of code  1kb and uses recursion to perform deep object merges   var absorb   require  absorb    var obj1  obj2   obj1     foo  123  bar  456    obj2     bar  123  key   value     absorb obj1  obj2    console log obj1      Output    foo  123  bar  123  key   value      You can also use it to make a clone or only transfer values if they don t exist in the source object  how to do this is detailed in the link provided

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I see that this thread is too old  but I put my answer here just in logging purposes      In one of the comments above you mentioned that you wanted to use    express  in your project which has  connect  library in the   dependency list  Actually  connect utils  library contains a  merge    method that does the trick  So you can use the 3rd party   implementation without adding any new 3rd party libraries

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Use spread operator  It is supported in Node since version 8 6   x000D   x000D  const object1    name   John    x000D  const object2    location   San Jose    x000D   x000D  const obj       object1     object2  x000D   x000D  console log obj  x000D         x000D          name    John   x000D          location    San Jose  x000D         x000D   x000D   x000D

User · Answer

There is an easy way of doing it in Node js  var object1    name   John    var object2    location   San Jose      To combine extend this we can use     operator in ECMA6   x000D   x000D  var object1    name   John    x000D  var object2    location   San Jose    x000D   x000D  var result     x000D       object1  x000D       object2 x000D    x000D   x000D  console log result  x000D   x000D   x000D

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If you need special behaviors like nested object extension or array replacement you can use Node js s extendify   var extendify   require  extendify       extend   extendify       inPlace  false      arrays    replace       isDeep  true      obj1         a           arr   1 2             b  4     obj2         a           arr   3            res     extend obj1 obj2   console log JSON stringify res        a    arr   3    b  4

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The below code will help you to merge two JSON object which has nested objects   function mergeJSON source1 source2                 Properties from the Souce1 object will be copied to Source2 Object         Note  This method will return a new merged object  Source1 and Source2 original values will not be replaced                var mergedJSON   Object create source2     Copying Source2 to a new Object      for  var attrname in source1            if mergedJSON hasOwnProperty attrname               if   source1 attrname   null  amp  amp  source1 attrname  constructor  Object                                       Recursive call if the property is an object                   Iterate the object and set all properties of the inner object                                 mergedJSON attrname    zrd3 utils mergeJSON source1 attrname   mergedJSON attrname                            else    else copy the property from source1             mergedJSON attrname    source1 attrname                             return mergedJSON

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Use merge     npm install merge   Sample code   var merge   require  merge       npm install -g merge     original  cloned   console log       merge   one   hello       two   world              one    hello    two    world    original     x    y  1       cloned   merge true  original    cloned x y     console log original x y  cloned x y      1  2

[javascript] Combine or merge JSON on node.js without jQuery

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